334 lines
11 KiB
Dart
334 lines
11 KiB
Dart
import 'package:didvan/constants/app_icons.dart';
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import 'package:flutter/material.dart';
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import 'dart:ui';
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class DidvanBNB extends StatefulWidget {
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final int currentTabIndex;
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final void Function(int index) onTabChanged;
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const DidvanBNB({
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Key? key,
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required this.currentTabIndex,
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required this.onTabChanged,
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}) : super(key: key);
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@override
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State<DidvanBNB> createState() => _DidvanBNBState();
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}
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class _DidvanBNBState extends State<DidvanBNB> with TickerProviderStateMixin {
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late int _activeIndex;
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late AnimationController _blobController;
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late Animation<double> _blobAnim;
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double _dragProgress = 0.0; // 0..1 between from->to
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int _dragFrom = 0;
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int _dragTo = 0;
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bool _isDragging = false;
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final GlobalKey _rowKey = GlobalKey();
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@override
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void initState() {
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super.initState();
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_activeIndex = widget.currentTabIndex;
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_blobController = AnimationController(
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duration: const Duration(milliseconds: 450),
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vsync: this,
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);
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_blobAnim = CurvedAnimation(parent: _blobController, curve: Curves.easeOutCubic);
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}
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@override
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void didUpdateWidget(covariant DidvanBNB oldWidget) {
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super.didUpdateWidget(oldWidget);
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if (widget.currentTabIndex != _activeIndex) {
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_animateTo(widget.currentTabIndex);
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}
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}
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void _animateTo(int newIndex) {
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setState(() {
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_dragFrom = _activeIndex;
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_dragTo = newIndex;
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_activeIndex = newIndex;
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_dragProgress = 0;
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_isDragging = false;
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});
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_blobController.forward(from: 0);
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}
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void _handleTap(int index) {
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if (index == _activeIndex) return;
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widget.onTabChanged(index);
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}
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void _startDrag(DragStartDetails d) {
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final box = _rowKey.currentContext?.findRenderObject() as RenderBox?;
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if (box == null) return;
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final local = box.globalToLocal(d.globalPosition);
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final width = box.size.width;
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final section = width / 4; // 4 items
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_dragFrom = _activeIndex;
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_dragTo = _activeIndex;
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_dragProgress = 0;
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_isDragging = true;
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final pointerIndex = (local.dx / section).clamp(0, 3).floor();
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if (pointerIndex != _activeIndex) {
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_dragTo = pointerIndex;
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}
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setState(() {});
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}
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void _updateDrag(DragUpdateDetails d) {
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if (!_isDragging) return;
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final box = _rowKey.currentContext?.findRenderObject() as RenderBox?;
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if (box == null) return;
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final width = box.size.width;
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final local = box.globalToLocal(d.globalPosition);
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final section = width / 4;
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final pointerIndex = (local.dx / section).clamp(0, 3).floor();
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if (pointerIndex != _dragTo) {
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_dragFrom = _activeIndex;
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_dragTo = pointerIndex;
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}
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// progress relative to dragFrom->dragTo centers
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final fromCenter = (_dragFrom + 0.5) * section;
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final toCenter = (_dragTo + 0.5) * section;
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final total = (toCenter - fromCenter);
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_dragProgress = total.abs() < 2 ? 0 : ((local.dx - fromCenter) / (total)).clamp(0.0, 1.0);
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setState(() {});
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}
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void _endDrag(DragEndDetails d) {
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if (!_isDragging) return;
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_isDragging = false;
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// decide final index
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final threshold = 0.5;
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final target = _dragProgress > threshold ? _dragTo : _dragFrom;
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if (target != _activeIndex) {
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widget.onTabChanged(target);
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} else {
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setState(() {});
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}
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}
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@override
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void dispose() {
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_blobController.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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final isDark = Theme.of(context).brightness == Brightness.dark;
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return Positioned(
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bottom: 12,
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left: 0,
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right: 0,
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child: GestureDetector(
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onHorizontalDragStart: _startDrag,
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onHorizontalDragUpdate: _updateDrag,
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onHorizontalDragEnd: _endDrag,
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child: SizedBox(
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height: 90,
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child: Stack(
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alignment: Alignment.center,
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children: [
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// Liquid blob painter behind icons
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LayoutBuilder(
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builder: (ctx, constraints) {
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final w = constraints.maxWidth;
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final section = w / 4;
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final fromCenter = (_dragFrom + 0.5) * section;
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final toCenter = (_dragTo + 0.5) * section;
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final t = _isDragging ? _dragProgress : _blobAnim.value;
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final center = fromCenter + (toCenter - fromCenter) * t;
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return CustomPaint(
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size: Size(w, 70),
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painter: _LiquidBlobPainter(
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progress: t,
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from: fromCenter,
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to: toCenter,
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center: center,
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color: (isDark ? Colors.blueAccent : Colors.deepPurpleAccent).withOpacity(0.18),
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highlight: (isDark ? Colors.blueAccent : Colors.deepPurpleAccent).withOpacity(0.35),
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),
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);
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},
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),
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// Icons row
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Align(
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alignment: Alignment.center,
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child: SizedBox(
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height: 70,
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child: Row(
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key: _rowKey,
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mainAxisAlignment: MainAxisAlignment.spaceEvenly,
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children: [
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_IconItem(
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index: 0,
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active: _activeIndex == 0,
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iconActive: DidvanIcons.house_solid,
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iconInactive: DidvanIcons.house_light,
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title: 'خانه',
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onTap: () => _handleTap(0),
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dragTarget: _dragTo,
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dragProgress: _dragProgress,
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isDragging: _isDragging,
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),
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_IconItem(
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index: 1,
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active: _activeIndex == 1,
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iconActive: DidvanIcons.category_solid,
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iconInactive: DidvanIcons.category_light,
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title: 'دستهبندی',
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onTap: () => _handleTap(1),
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dragTarget: _dragTo,
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dragProgress: _dragProgress,
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isDragging: _isDragging,
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),
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_IconItem(
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index: 3,
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active: _activeIndex == 3,
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iconActive: DidvanIcons.ai_solid,
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iconInactive: DidvanIcons.ai_regular,
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title: 'هوشان',
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onTap: () => _handleTap(3),
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dragTarget: _dragTo,
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dragProgress: _dragProgress,
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isDragging: _isDragging,
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),
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_IconItem(
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index: 2,
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active: _activeIndex == 2,
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iconActive: DidvanIcons.stats__solid,
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iconInactive: DidvanIcons.stats__light,
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title: 'آمار و داده',
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onTap: () => _handleTap(2),
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dragTarget: _dragTo,
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dragProgress: _dragProgress,
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isDragging: _isDragging,
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),
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],
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),
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),
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),
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],
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),
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),
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),
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);
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}
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}
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class _LiquidBlobPainter extends CustomPainter {
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final double progress; // 0..1
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final double from;
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final double to;
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final double center;
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final Color color;
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final Color highlight;
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_LiquidBlobPainter({
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required this.progress,
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required this.from,
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required this.to,
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required this.center,
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required this.color,
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required this.highlight,
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});
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@override
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void paint(Canvas canvas, Size size) {
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// Single capsule shape that stretches between from & interpolated center.
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final baseY = size.height / 2;
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final lerp = center;
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final start = from < lerp ? from : lerp;
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final end = from < lerp ? lerp : from;
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final radius = 26.0;
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final rect = Rect.fromLTRB(start - radius, baseY - radius, end + radius, baseY + radius);
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final rrect = RRect.fromRectAndRadius(rect, Radius.circular(radius));
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final paint = Paint()
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..shader = LinearGradient(
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begin: Alignment.topLeft,
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end: Alignment.bottomRight,
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colors: [
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color.withOpacity(0.9),
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color.withOpacity(0.4),
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],
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).createShader(rect);
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// Draw blurred base using saveLayer for slight glow
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canvas.saveLayer(rect.inflate(20), Paint());
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canvas.drawRRect(rrect, paint);
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final glow = Paint()
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..maskFilter = const MaskFilter.blur(BlurStyle.normal, 20)
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..color = highlight.withOpacity(0.5);
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canvas.drawCircle(Offset(lerp, baseY), 14 + 6 * progress, glow);
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canvas.restore();
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}
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@override
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bool shouldRepaint(covariant _LiquidBlobPainter old) =>
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old.progress != progress || old.from != from || old.to != to || old.center != center || old.color != color;
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}
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class _IconItem extends StatelessWidget {
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final int index;
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final bool active;
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final IconData iconActive;
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final IconData iconInactive;
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final String title;
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final VoidCallback onTap;
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final int dragTarget;
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final double dragProgress;
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final bool isDragging;
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const _IconItem({
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required this.index,
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required this.active,
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required this.iconActive,
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required this.iconInactive,
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required this.title,
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required this.onTap,
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required this.dragTarget,
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required this.dragProgress,
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required this.isDragging,
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});
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@override
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Widget build(BuildContext context) {
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final scheme = Theme.of(context).colorScheme;
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final isDark = scheme.brightness == Brightness.dark;
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final base = scheme.onSurface; // fallback since title extension not imported here
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final activeColor = scheme.primary;
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return GestureDetector(
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onTap: onTap,
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behavior: HitTestBehavior.translucent,
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child: AnimatedContainer(
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duration: const Duration(milliseconds: 300),
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curve: Curves.easeOutCubic,
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padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 4),
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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AnimatedScale(
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duration: const Duration(milliseconds: 400),
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curve: Curves.easeOutBack,
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scale: active ? 1.15 : 1.0,
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child: Icon(
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active ? iconActive : iconInactive,
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size: 26,
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color: active ? activeColor : base.withOpacity(isDark ? 0.8 : 0.65),
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),
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),
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const SizedBox(height: 2),
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AnimatedDefaultTextStyle(
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duration: const Duration(milliseconds: 300),
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curve: Curves.easeOut,
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style: Theme.of(context).textTheme.bodySmall!.copyWith(
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fontSize: 11,
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fontWeight: active ? FontWeight.w700 : FontWeight.w500,
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color: active ? activeColor : base.withOpacity(0.6),
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),
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child: Text(title, maxLines: 1, overflow: TextOverflow.fade),
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),
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],
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),
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),
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);
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}
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} |